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PENSION AND OTHER POST-EMPLOYMENT BENEFITS - Schedule of Components of Net Periodic Benefit Costs (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Pension and OPEB prior service costs amortized out of AOCI       $ 1
Pension        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Service costs $ 35 $ 35 $ 70 69
Interest costs 100 107 199 216
Expected return on plan assets (132) (142) (265) (270)
Amortization of prior service costs (credits) 0 1 1 1
Special termination benefits 0 5 0 5
Pension and OPEB mark-to-market adjustment 0 (59) 0 (59)
Net periodic benefit costs (credits) 3 (53) 5 (38)
Net periodic benefit costs (credits), net of amounts capitalized (15) (70) (30) (73)
OPEB        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Service costs 0 0 1 1
Interest costs 5 6 10 11
Expected return on plan assets (9) (8) (17) (16)
Amortization of prior service costs (credits) 0 (2) (1) (4)
Special termination benefits 0 2 0 2
Pension and OPEB mark-to-market adjustment 0 0 0 0
Net periodic benefit costs (credits) (4) (2) (7) (6)
Net periodic benefit costs (credits), net of amounts capitalized $ (3) $ (3) $ (7) $ (7)